Calculator.



PATENTED MAY 8, l906.

K. H. J. MARGKWORDT. CALCULATOR.

APPLICATION FILED 00T.9, 1905.

12o 3299-- Gl ATTORNEYS yIo ' KARL'- nnilinnenl JOHANN- MARcirwoRnr, orGUATEMALA, GUATEMALA.

ICALCULATOEQ To all whom t 'may concern.-

Be: it vknown that I, KARL HEINRICH Jo- HANN MARCKWORDT.; a subject ofthe German fEmperor, and a=resident ot Guatemala, Gua- -i Ltem'ala,.haveinvented a new and vImproved Calculator, ot'which the following isafull, clear, and exact description. I

, The invention relates to registers 5 andl its yobject is Ito provide anew and improved calculator more specially designed forconveniently-,and accurately carrying out'arith'metical calculations,such as calculating wages,

.volumes, multiplication, degrees of alcohol, lumber. measures, degreesor sugar polarization, :and the like.

i Thel invention lconsists of novel features and `parts and combinationsof the same, `as will be more iiully described hereinafter and thenpointed out inthe claims. A prac-tical. embodiment of the invention isrepresented inl-the accompanying drawings,

and reales.

forming a part of this s eciiication, in which similar characters ot reerence indicate corresponding parts in all the views.

Figure 1 is ap'lan view of the improvement, parts being broken away.Figi 2 is a face view of a table -tor calculating wages in pesos forcalculating wages in dollars and cents, and Fig. 4 is a transversesection oi the improvement on thejine 4 4 of Fig. l.

The improved calculator, as illustrated in Figs. 1 and 4, is preferablymade in the form of two l metallic plates A and B, connected with eachother by' a hinge C to allow of swinging the plates A and B into an openposition for the convenient insertion of tables, as hereinafter moreAfully described. The plates A and B are provided on their outer faceswith face-plates A and B', and between the-tacefplates A and B and theirplates A and B aremounted to slide setsoi transverse slides D and setsof longitudinal slides E, the slides beingapertured, and the outwardsliding movement of the slides D and E is limited by suitable stops Fand F.

(See Fig. l.) The plates A and B and their l face-plates A and B areprovided with calculating-apertures G, arranged in transverse andlongitudinal rows, so that whenl the slides D and E are drawn into anoutermost position their apertures register' with the correspondingcalculating-apertures G.- Each of the plates A and B is also providedwithrows 0f factor-apertures H and I, locatednear the Specicaton ofLetters Patent. Appnmin and' october 9,1995. serinnazszpvz.

Fig.' 3 is a like view of a table Batenteol May 8, i906.-

l margins of the plates, as yplainly. indicated in the drawings.`

In connection with the apparatus use is ina-de of calculating-tables J,such as shown ginal rows of numerals H" andy I, registering withtheapertures H and l whenever a. table JJ'isfplaced on the inner facevof the corresponding plate A or B. Each of the tables ,in Figs. 2 and3, each table containing mar- 6o J isalso provided with the calculationsG', in- 65 dicating the product of the factors contained in the rows ofnumerals H and l', and the calculations G are adapted to register withthe apertures G and those in the ,slides D and E whenever the latter aredrawn out. stance, as shown in 2, the factors H in dicate the wage perday in reales and the factors i indicate theworking days, while thecalculations @"-indicate the amount of the For ,in- 7o wages for 'thecorresponding number of days 75 and the wage per day. Now when thistable J is placed in position on the rear face ofthe plates A or B andthe several slides D and E are vin aninnermostjposition and it isdesired a day, then the operator draws theslide registering with thenumeral 5,- appearing through the opening i, and also draws the slide Dopposite the numeral i5, "appearing through the corresponding apertureH. Fig. l.) Now when the slides are drawn as described the numeral 9.3appears, indicating that-'stile wage is nine pesos and three reales, itbeing understood that a peso is Vto tin-d the wage for tive days at'fifteen reales gio (See 85 eight reales, and consequently fifteenmulti- 9o plied by iive equals se venty-iive and. seventyive divided. byeight equals 9.3.

` in order to avoid misiinderstandings, the table J (shown in Fig. 2)provided with the numeral K representing one-eighth, thus in 95 dicatingthat the table is to be used whencal? culating the wages in pesos andreales. in a,

like manner if the table J is used, as shown in Fig. 3, and proceedingin the manner` above described, the wages in dollars and cents can roobe readily found on drawing the correspond ing slides D and E after thetable is placed in position on the rear face yoi the plate A or B.

'ln order to conveniently hold the table J in position against the innerface of the cor- '105 responding plate A or B, a partition L is used,.placed between the two tables,so as'to pressV the sancein contact withthe corresponding plates A and B when the latter are in a closedposition, as planly'indicated in Fig. 1i.

rial

-With the calcu Although I have given but samples of tables forcalculating wages, it is evident that similar tables may be constructedfor carrying on other calculations than the ones mentioned.

Having thusdescribed my invention, -I claimv as new and desire to secureby Letters Patent- 1. A calculating device comprising a plate havingcalculation a ertures arran ed in transverse and longitudinal rows, fordisclosing the calculation, the plate also having nj. ar-

inal rows of factor-apertures for disclosing actors, asecond platehaving apertures 'corresponding, to the calculation-apertures on thefirst platefand secured thereto, sets ol' transverse and longitudinalslides for opening and closing the said apertures and arranged betweenthe plates, the slides having apertures adapted to register with thecalculation-apertures, and a table adapted to be placed on the rear faceof the plate and havlng marginal factorsv appearing through thefactor-openin sand calculations registering ation-apertures.

2. Acalculatingdevice comprising a pair of plates hinged together andeach having calculatipn-apertures arranged in'transverse andlongitudinal rows for disclosing the calculation, each plate also havingmarginal rows of factor-apertures for disclosing factors, a secondplatehaving apertures correspending to the calculation-.apertures of theiirst late and secured thereto, sets of aperturedp transverse andlongitudinal slldesfl mounted to Aslide between the plates, theslide-openings being ada ted to register with the factor-apertures wliendrawn into an outermost position, means for limiting the outward motionof the slides, and tables placed on the rear faces of theiirst-namedplate, each table having marginal factors appearing through thefactor-openings and calculations registering with thecalculation-apertures,

3. A calculating device comprising a pair of plates hinged together andeach having calculation-apertures arranged in transverse .andlongitudinal rows for disclosing the calculation, each plate also havingmarginal rows of factor-apertures for disclosing fac-l tors, sets ofapertured transverse and longitudinal slides 'facey of each plate, theslide-openings being adapted to register with the factor-apertures whendrawn into an outermost position, te, bles placed on the rear facesofthe said plates each table having marginal factors appearing Y throughthe factor-openings and calculations registering, with' the calculationapertures, and4 a partition between the said tables for separating thesame and holding thev tables against the corresponding faces of the,plates. In testimony whereof I have signed my name to this specificationin the presence of two-subscribing witnesses.

KARL HEINRICH JOHANN l'lIARCKWURDT,

itnesses:

J. YRIGOYEN, EMIL ZvEpIKE.

mounted to slide on the outerv

